package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WorkspaceService workspaceService;

    /**
     * 统计指定时间区间内的营业额数据
     * @param begin
     * @param end
     * @return
     */
    @Override
    public TurnoverReportVO getTurnOverStatistisc(LocalDate begin, LocalDate end) {
        //当前集合用于存放从begin到end范围内的每天的日期
        List<LocalDate> dateList=new ArrayList<>();
        dateList.add(begin);
        while(!begin.equals(end)) {
            //日期计算,计算指定日的后一天对应的日期
            begin=begin.plusDays(1);
            dateList.add(begin);
        }
        String sDateList= StringUtils.join(dateList, ",");

        //存放每天营业额
        List<Double> trunoverList=new ArrayList<>();
        for (LocalDate date : dateList) {
            //查询date日期对应的营业额数据,营业额是指:状态为"已完成"的订单金额
            LocalDateTime beginTime=LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime=LocalDateTime.of(date, LocalTime.MAX);

            //select sum(amount) from orders where order_time >beginTime and order_time < endTime and status =5
            Map map=new HashMap();
            map.put("begin",beginTime);
            map.put("end",endTime);
            map.put("status", Orders.COMPLETED);
            //如果当天没有营业额返回的不是0,而是null
            //TODO:可以合并为一个SQL
            Double trunover= orderMapper.sumByMap(map);
            trunover=trunover==null?0.0:trunover;
            trunoverList.add(trunover);
        }

        String sTrunoverList=StringUtils.join(trunoverList, ",");
        //封装返回结果
        return TurnoverReportVO
                .builder()
                .dateList(sDateList)
                .turnoverList(sTrunoverList)
                .build();
    }

    /**
     * 统计指定时间区间内的用户数据
     * @param begin
     * @param end
     * @return
     */
    @Override
    public UserReportVO getUserStatistisc(LocalDate begin, LocalDate end) {
        //当前集合用于存放从begin到end范围内的每天的日期
        List<LocalDate> dateList=new ArrayList<>();
        dateList.add(begin);
        while(!begin.equals(end)) {
            //日期计算,计算指定日的后一天对应的日期
            begin=begin.plusDays(1);
            dateList.add(begin);
        }
        String sDateList= StringUtils.join(dateList, ",");

        LocalDateTime minTime=LocalDateTime.of(dateList.get(0), LocalTime.MIN);
        Map minMap=new HashMap();
        minMap.put("begin",minTime);
        Integer mintotalUser=userMapper.countByMap(minMap);
        //count聚合返回返回值一定不为空,所以不用判断为空的时候
        mintotalUser=mintotalUser==null?0:mintotalUser;
        Integer totalUser;

        //每天新增用户量
        List<Integer> newUserList=new ArrayList<>();
        //每天用户总量
        List<Integer> totalUserList=new ArrayList<>();

        for (LocalDate date : dateList) {
            LocalDateTime beginTime=LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime=LocalDateTime.of(date, LocalTime.MAX);

            Map map=new HashMap();
            map.put("end",endTime);
            //总用户量
            totalUser=userMapper.countByMap(map);
            totalUser=totalUser==null?0:totalUser;
            totalUserList.add(totalUser);
            newUserList.add(totalUser-mintotalUser);
            mintotalUser=totalUser;

            //老师是这么做的,但这样查询数据库的次数也太多了吧
            //map.put("begin",beginTime);
            //Integer newUser=userMapper.countByMap(map);
            //newUserList.add(newUser);
        }

        String sTotalList=StringUtils.join(totalUserList, ",");
        String sNewUserList=StringUtils.join(newUserList, ",");
        return UserReportVO
                .builder()
                .dateList(sDateList)
                .newUserList(sNewUserList)
                .totalUserList(sTotalList)
                .build();
    }

    /**
     * 统计指定时间内的订单数据
     * @param begin
     * @param end
     * @return
     */
    @Override
    public OrderReportVO getOrderStatistisc(LocalDate begin, LocalDate end) {
        //当前集合用于存放从begin到end范围内的每天的日期
        List<LocalDate> dateList=new ArrayList<>();
        dateList.add(begin);
        while(!begin.equals(end)) {
            //日期计算,计算指定日的后一天对应的日期
            begin=begin.plusDays(1);
            dateList.add(begin);
        }
        String sDateList= StringUtils.join(dateList, ",");

        //每天订单总数
        List<Integer> orderCountList=new ArrayList<>();
        //每天有效订单数
        List<Integer> validOrderCountList =new ArrayList<>();
        //区间内订单总数
        Integer totalOrderCount=0;
        //区间内有效订单数量
        Integer validOrderTotalCount=0;
        for (LocalDate date : dateList) {
            //查询每天的订单总数 select count(id) from orders where order_time > ? and order_time < ?
            LocalDateTime beginTime=LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime=LocalDateTime.of(date, LocalTime.MAX);
            Integer orderCount=getOrderCount(beginTime,endTime,null);
            orderCountList.add(orderCount);
            totalOrderCount+=orderCount;
            //查询每天的有效订单数 select count(id) from orders where order_time > ? and order_time < ? and status=5
            Integer validOrderCount=getOrderCount(beginTime,endTime,Orders.COMPLETED);
            validOrderCountList.add(validOrderCount);
            validOrderTotalCount+=validOrderCount;
        }
        String sorderCountList=StringUtils.join(orderCountList, ",");
        String svalidOrderCountList=StringUtils.join(validOrderCountList, ",");

        //老师使用的stream流
        //totalOrderCount=orderCountList.stream().reduce(Integer::sum).get();
        //validOrderTotalCount=validOrderCountList.stream().reduce(Integer::sum).get();

        //订单完成率
        double orderCompletionRate=0.0;
        if(totalOrderCount!=0){
            orderCompletionRate=(double)validOrderTotalCount/totalOrderCount;
        }
        return OrderReportVO
                .builder()
                .dateList(sDateList)
                .orderCountList(sorderCountList)
                .validOrderCountList(svalidOrderCountList)
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderTotalCount)
                .orderCompletionRate(orderCompletionRate)
                .build();
    }

    /**
     * 根据条件统计订单数量
     * @param begin
     * @param end
     * @param status
     * @return
     */
    private Integer getOrderCount(LocalDateTime begin, LocalDateTime end,Integer status) {
        Map map=new HashMap();
        map.put("begin",begin);
        map.put("end",end);
        map.put("status",status);
        return orderMapper.countByMap(map);
    }

    /**
     * 统计指定时间区间内的销量排名前十
     * @param begin
     * @param end
     * @return
     */
    @Override
    public SalesTop10ReportVO getsalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTime, endTime);
        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String nameList=StringUtils.join(names, ",");
        String numberList=StringUtils.join(numbers, ",");
        return SalesTop10ReportVO
                .builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }

    /**
     * 导出运营数据报表
     * @param response
     */
    @Override
    public void exportBusinessData(HttpServletResponse response) {
        //1.查询数据库,获取营业数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);
        LocalDate dateEnd = LocalDate.now().minusDays(1);
        //查询概览数据
        BusinessDataVO businessDataVO=workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));
        //2.通知POI将数据写入到Excel文件中
        //in不需要被显式关闭，类加载器管理的资源通常会在类加载器被垃圾收集器回收时自动关闭，或者在应用程序结束时由JVM清理
        InputStream in= this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");
        try {
            //基于模板文件创建一个新的excel文件
            XSSFWorkbook excel = new XSSFWorkbook(in);
            //填充数据--时间
            XSSFSheet sheet=excel.getSheet("Sheet1");
            sheet.getRow(1).getCell(1).setCellValue("时间:"+dateBegin+"至"+dateEnd);
            XSSFRow row=sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());
            row=sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());
            //填充明细数据
            for (int i = 0; i < 30; i++) {
                 LocalDate date=dateBegin.plusDays(i);
                 //查询某一天的营业数据
                 BusinessDataVO busineaaData= workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));

                 //获得某一行
                 row=sheet.getRow(7+i);
                 row.getCell(1).setCellValue(date.toString());
                 row.getCell(2).setCellValue(busineaaData.getTurnover());
                 row.getCell(3).setCellValue(busineaaData.getOrderCompletionRate());
                 row.getCell(4).setCellValue(busineaaData.getOrderCompletionRate());
                 row.getCell(5).setCellValue(busineaaData.getUnitPrice());
                 row.getCell(6).setCellValue(busineaaData.getNewUsers());

            }
            //3.通过输出流经Excel文件下载到客户端浏览器
            ServletOutputStream out = response.getOutputStream();
            excel.write(out);

            //4.关闭资源
            out.close();
            excel.close();
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

    }
}
